LOCATION.-- Lat 42°36'33", long 89°04'14" (NAD of 1927), in NE 1/4 sec.28, T.2 N., R.12 E., Rock County, Hydrologic Unit 07090001, on right bank in Afton, 0.3 mi downstream from highway bridge and 1.1 mi upstream from Bass Creek.

DRAINAGE AREA.-- 3,340 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: January 1914 to current year. Monthly discharge for January 1914 published in WSP 1308.

REVISED RECORDS.-- WSP 1238: 1916(M), 1919(M), 1933, 1937-38, 1943. WDR WI-79-1: Drainage area.

GAGE.-- Water-stage recorder and satellite telemeter. Datum of gage is 742.36 ft above NGVD of 1929. Prior to Aug. 23, 1932, a nonrecording gage 20 ft upstream, and Aug. 23, 1932, to Sept. 30, 1933, water-stage recorder, at same site at datum 1 ft higher.

REMARKS.-- Diurnal fluctuation caused by powerplants above station.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 13,000 ft³/s, March 23 and 24, 1929, gage height, 11.81 ft, present datum; maximum gage height, 13.05 ft, February 5, 1916, present datum, backwater from ice; minimum daily discharge, 42 ft³/s, August 25 and 26, 1934.